INDEX. 



Abrothallus, organs of reproduction of, i. 307 

 Absorption of light and heat, i. 34 



effects of, i. 35, 36 



generally independent of colour, i. 36 



Melloni's investigations into the laws of, i. 38 



Prof. Tyndall's experiments, i. 38 



amount of radiant heat absorbed by the perfumes of flowers and 

 plants, i. 43-45 



experiments showing radiation to be equal to absorption, i. 46 



great absorption of olefiant gas, i. 47 



absorptive power of aqueous vapour, i. 53 



dynamic absorption, i. 49 



absorption a phenomenon irrespective of aggregation, i. 53 



absorption of invisible rays by solids, liquids, and gases, i. 65 

 Absorption bands in the red and green parts of the solar spectrum, i. 131 

 Acalepha, the simple hydra a phase in the life of the, ii. 91 

 Acalephse, Campanograde, characters of, ii. 103 

 Acalephse, Ciliograde, characters of the, ii. 101 



mode of reproduction of, ii. 103 

 Acalephse, Physograde, characters of, ii. 107 

 Acanthometrse, structure and habitat of, ii. 19 

 Acetic acid, chemical combination forming, i. 97 

 Acetic fermentation, fungus producing, i. 288 

 Acetylene, formation of, i. 97 



